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This article (which I was reminded of by this thread) gives an overview of sleep for teenagers, and it isn't radically different for anyone else either:

https://www.nhs.uk/live-well/sleep-and-tiredness/why-are-tee...

I expect that there is variation within the general population with regards to body clocks.

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This would still be consistent with there being genetic (or otherwise hard to change in adulthood) factors that make a person function better with a shifted sleep cycle. It's not at all clear that it's all environmental (like the post I replied seemed to imply) and I find it irritating when people make such sweeping claims without evidence.

That's an entirely reasonable thing to be irritated at.

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